No need for the plumbers book IMO. Just search the Fal Files build it yourself section. Everything you ned to know is there. Barreling, timing, headspacing, it's all pretty easy if you have the correct tools.

I agree with you. that said there are some good build sights on the web.

Yes, FALFILES is a very good site. Just be careful from whom you receive guidance. There are a few of posters there that are real jerks. The one that goes by the username Hebrew Battle Rifle comes to mind right away.